A porous cryogel with opposing wettability was successfully fabricated using cellulose acetate and polyvinyl alcohol through a simple freeze-drying method for oil-water separation application. It was made by means of water as the medium of mixing to eliminate the use of any hazardous organic solvents which makes it a completely toxic-free and environmentally friendly material. The prepared material was treated with sodium hydroxide (NaOH) to produced hydroxyl groups on the pore structure of the cryogel which led to the increase of its hydrophilicity. On the other hand, methyltrimethoxysilane (MTMS) was used to functionalize the cryogel giving its framework structure an enhanced hydrophobic property. These techniques were carried out to effectively separate water and oil mixture. Moreover, it has high reusability, flexibility, sustainability, durability, and robustness even when exposed to various types of oil due to its exceptional physical properties and is also benign and ecological because of its biodegradability and nontoxicity.

使用醋酸纤维素和聚乙烯醇通过简单的冷冻干燥方法成功地制备了具有相反润湿性的多孔冷冻凝胶，用于油水分离应用。它是通过以水为混合介质制成的，从而消除了对有害有机溶剂的使用，这使其成为一种完全无毒且环保的材料。所制备的材料用氢氧化钠（NaOH）处理以在冷冻凝胶的孔结构上产生羟基，这导致其亲水性的增加。另一方面，使用甲基三甲氧基硅烷（MTMS）对冷冻凝胶进行功能化，使其骨架结构具有增强的疏水性。进行这些技术以有效地分离水和油的混合物。而且，它具有很高的可重用性，灵活性，可持续性，